Design Earthquake for Nuclear Power Plants Considering Variability of Soil Parameters
37th Annual CNS-CNA Student Conference - 2013 June 11


Presented at:
37th Annual CNS-CNA Student Conference
2013 June 11
Location:
Toronto, Canada
Session Title:
Student Conference Session

Authors:
Bo Li (University of Waterloo)
Shun-Hao Ni (University of Waterloo)
Wei-Chau Xie (University of Waterloo)
M.D Pandey (University of Waterloo)
  

Abstract

This study presents a probabilistic framework to accurately estimate ground motions at the soil surface. In this framework, the variability of soil parameters, the nonlinear property of soils, and the vector-valued seismic site responses analysis comprehensively integrate into Probabilistic Seismic Hazard Analysis (PSHA) for soil sites. As local soil conditions greatly affect ground motions propagating from bedrock to soil surface, the evaluation of ground motions at the soil surface needs to consider effects of the local soil conditions. Ground Motion Prediction Equations (GMPEs) using the generic soil to characterize local soil conditions are able to estimate ground motions at the soil surface, but the estimation is not acceptable for critical structures because of lacking accuracy. Site amplification is used to modify the bedrock GMPEs to make them suitable for soil site. Based on the modified GMPEs, PSHA for soil sites are performed accurately and a method to construct acceptable soil UHS are proposed. Finally, this paper constructs the soil UHS for a soil site in Charleston by GMPEs using the generic soil and by the modified GMPEs considering the local soil conditions in detail (i.e., the proposed method in this paper), respectively, compares the soil UHS by these different methods, studies influences of variability of soil parameters on spectral shapes and spectral amplitudes of the soil UHS.

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